The Deglet Noor, along with the Medjul are by far and away the most consumed dates in the Untied States together making up over 90% of the dates produced in the United States. While the Medjul is popular as a whole date, the Deglet is used primarily in cooking and other applications where it is chopped up. This is not to say that the Deglet is not a good date to eat whole, far from it, but it goes to show the versatility of the Deglet Noor.
The Deglet Noor was the original tree that was transported to the United States from across the ocean. It was already a popular date in Europe, North Africa, and the Middle East so it made since to try to grow them in the American deserts. There were other date trees in the Americas at the time, but they were brought over as seeds by Spanish missionaries, and so were not recognized a true date variety, and were not marketable. The Deglet Noor was originally brought over to the United States in 1900 from Algeria, and has been the primary date grown in the United States ever since.
The Deglet is a dry variety of date that is brown in color and is an oblong shape. It is the latest variety of date to be picked with harvest usually starting in November lasting sometimes until Christmas. Compare this to other varieties such as Barhi and Khadrawi that are picked starting in August. The Deglet is one of my personal favorites and due to its texture and mild taste it is a great date for someone new to dates to try not to mention great to cook with.